Kaliningrad Oblast of Russia could become a separate 4th baltic republic, at the same time recognising its former German history.

That would have been possible and personally I would have nothing against restoring Eastern Prussia [including its Polish part as well]. The only obstacle to that is that there are hardly any ethnic Germans within that region. Here is the ethnic composition of the ex-Koeniksberg:

Russians: 78%
Belorussians: 8,5%
Ukrainians: 7,2%
Lithuanians: 2,1%

According to the latest data I found only 5751 Germans live in kaliningrad region (majority have been migrating to Kaliningrad from Kazakhstan from 1950s till present time) and they form a group of Russische Deutschen.

So, considering all this Kaliningrad can just stay as one of Russia`s regions.

If I were given the chance to redefine the boundaries of the world, I would do this:
All ethnic regions should be independant, but allied. Also, Northen Ireland should go to Ireland, and any of those that don't like having the sovereignty of Ireland over them in Ulster should move to an auslander state such as the USA, Canada, or Australia. Scotland and Wales should also be independant. Armenia should reclaim its territories which still house majority Armenians, however sometimes their claims to territory are a bit exaggerated. Turkey should be wiped off the face of Europe and Constantinople returned to its Greek heritage. The Basque's should have their own homeland, and Belgium should be divided between France, the Netherlands, and Germany. Switzerland should be divided between Germany, France, and Italy. The parts of eastern Europe which are predominantly Russian, however are under other governments (such as eastern Ukraine), should be given to Russia. Ethnic determination would prove to be a valuable driving force for the economies and the general well-being of all nations. Any whites living inside of European countries who are not living with their ethnicity, should be returned to their homeland or given the oppurtunity to move to an auslander nation. All non-whites should leave willingly or face sterilization & internment until their deaths. All people of mixed race will share the same fate. All people's of mixed ethnicity (i.e. a person of mixed Russian, German, and Hungarian blood) should be placed in the nation where their prominent ethnicity is, or if it is evenly divided then they can choose and assimilate into that nation. I would keep Europe strictly ethnically divided, and not allow immigration from any other nation unless the person in question was either a first or second generation with a definate genetic heritage to a country in Europe. I am from the USA (1/2 English, 1/4 Irish, and 1/4 Russian), and I think that others like me with mixed backgrounds should be able to move around within he auslander white nations, however we should not be able to migrate back to Europe. Europe should remain a replenishable gene pool to produce individual societies and cultural backgrounds working together for a common good.
This would be my plan for the white and non-white societies, however I truly do not care what should happen to non-whites as long as they do not adversely affect us and our ascent to the stars. If people looked at it objectively, instead of power-mongering, they would see that redefining the boundaries along ethnicity, and possibly shifting the locations of populations in order to be able to do so, would work out for the best in the end. It would be a very difficult thing to do, but in the end it would pay off as there would no longer be inter-ethnic conflicts if every ethnicity (to a certain level) were given their own land, government, and right to pursue their own destiny.

Nationalism is appreciated here naturally, but when the nationalism takes a chauvinist turn, it's not WN anymore - and as far as I'm aware it's also against the guidelines of SF.

Dr A.J is "discreetly" hinting about the reconquering and thus slaughtering the people of the Baltic countries if the natives do not start to play by the rules dictated by Kremlin. Is this right (both the behaviour of doc and the way Kremlin is poking the domestic affairs of the neighbouring countries) I would like to hear the answer yes or no and then some explanations, please